It was one more autograph of an estimated 775,000, Dan Aykroyd quipped. But this one inked the deal on a new, police-equipped Dodge Charger that the popular actor, a Hinds County reserve deputy since January, bought and donated to the Hinds County Sheriff's Department.

The actor, best loved for the hilarity he brought to "Saturday Night Live," "Ghostbusters" and "The Blues Brothers," lent his celebrity and his checkbook to help the department and looked ahead to a Jackson weekend that'll also boost Medgar Evers Homecoming activities and movie work in Mississippi.

The 2014 Dodge Charger with a police package sports an emblem that merges iconic images from two of Aykroyd's best-loved films: support for bluesmen but ghosts beware. "That's two of my favorite things right there," Aykroyd noted. As with World War II fighter planes and bombers, the logo can signal achievements and progress by the unit.

After a quick negotiation inside, Aykroyd, facing a flank of cameras and fans at Roundtree Chrysler Dodge Jeep Ram in Jackson, pulled out a check and signed the contract, using the back of the nearest deputy for support.

Afterward, Hinds Deputy Ramous Austin said he believes Aykroyd's got his back "100 percent. At least you know I got his."

Good thing. Aykroyd's going out with Austin today into some of the community's more challenged areas, Aykroyd said. "I'm very excited about seeing that. It will help me to assess some of the other needs me and my friends might be able to help the department with."

Hinds County Sheriff Tyrone Lewis swore Aykroyd in as a reserve deputy in January, while the actor was in town for filming "Get On Up," the James Brown biopic due out in August. Aykroyd is following up on a desire to help the department and serve the citizens better, Lewis said. "He wanted to know what our needs were," and one of those needs is cars.

"All those movies I did, all those fine television shows and films and records, I didn't do them alone. It always is collaboration and teamwork," Aykroyd said. "If the police and the community do not work together ... there's no point in having a police force.

"That's alive and well in professional law enforcement throughout the world, and certainly we can see it in this community here today. So it's my pleasure to come up here to this beautiful city of Jackson — architecturally beautiful, beautiful hearts in the people — and to help to defend its reputation and its safety."

The car will go out with the county's reserve unit "and do good."

Roundtree general manager Jeremy Ferraez said the sticker price was $32,300 (before lights), but in extending the partnership with the Hinds County Sheriff's Department, "we helped out there, too." And Aykroyd brought talents to the table. "He's a shrewd businessman as well as a bluesman."

The actor's to-do list included fundraisers and the Medgar Evers Homecoming Gospel Show Thursday. He also planned to meet with the Mississippi Film Commission today.

Aykroyd is in Jackson to raise money for the Medgar Evers Foundation — "remembering the struggle, the fact that the struggle still goes on, it never stops and just to recognize and bring some focus to this great family," he said.

Saturday, he'll join blues legend Bobby Rush at the Medgar Evers Homecoming Blues Concert at the Regency Hotel and Conference Center. Grady Champion, Eddie Cotton and more are on the bill, too. Aykroyd won't "go the full Elwood," he said, but he'll be representing "The Blues Brothers" act "in a good way." Tickets are available at the coliseum box office and www.ticketmaster.com.

Jamming with Bobby Rush "is going to be a highlight of my life," Aykroyd said.

"We started House of Blues in 1994, and of course, we've had Bobby at our clubs. Our mission — our mission from God, really — is to make people aware that there are blues artists out there. The veterans, the venerable, those that are new to it, and those who have done it for many years, and they need our attention, their records sold and concerts attended.